Importance

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Abstract

A mobile communication system enables data reception in correct order, with regard to a reversed data order caused by a route change in data transfer from a source base station to a target base station and in direct transmission from a gateway to a target base station is provided. In the mobile communication system, at the time of handover processing performed accompanying a movement of the user equipment from the source base station to the target base station, the source base station transfers to the target base station, a part of packet data not yet transmitted to the user equipment, among packet data received from the upper-level device, and when transferring the part of packet data, the source base station assigns transfer start information, indicating a start of transfer, to a header in a top packet of the untransmitted packet data.

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First Claim